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node_modules/mdast-util-to-hast/lib/handlers/footnote-reference.js

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+/**
+ * @typedef {import('hast').Element} Element
+ * @typedef {import('mdast').FootnoteReference} FootnoteReference
+ * @typedef {import('../state.js').State} State
+ */
+
+import {normalizeUri} from 'micromark-util-sanitize-uri'
+
+/**
+ * Turn an mdast `footnoteReference` node into hast.
+ *
+ * @param {State} state
+ *   Info passed around.
+ * @param {FootnoteReference} node
+ *   mdast node.
+ * @returns {Element}
+ *   hast node.
+ */
+export function footnoteReference(state, node) {
+  const clobberPrefix =
+    typeof state.options.clobberPrefix === 'string'
+      ? state.options.clobberPrefix
+      : 'user-content-'
+  const id = String(node.identifier).toUpperCase()
+  const safeId = normalizeUri(id.toLowerCase())
+  const index = state.footnoteOrder.indexOf(id)
+  /** @type {number} */
+  let counter
+
+  let reuseCounter = state.footnoteCounts.get(id)
+
+  if (reuseCounter === undefined) {
+    reuseCounter = 0
+    state.footnoteOrder.push(id)
+    counter = state.footnoteOrder.length
+  } else {
+    counter = index + 1
+  }
+
+  reuseCounter += 1
+  state.footnoteCounts.set(id, reuseCounter)
+
+  /** @type {Element} */
+  const link = {
+    type: 'element',
+    tagName: 'a',
+    properties: {
+      href: '#' + clobberPrefix + 'fn-' + safeId,
+      id:
+        clobberPrefix +
+        'fnref-' +
+        safeId +
+        (reuseCounter > 1 ? '-' + reuseCounter : ''),
+      dataFootnoteRef: true,
+      ariaDescribedBy: ['footnote-label']
+    },
+    children: [{type: 'text', value: String(counter)}]
+  }
+  state.patch(node, link)
+
+  /** @type {Element} */
+  const sup = {
+    type: 'element',
+    tagName: 'sup',
+    properties: {},
+    children: [link]
+  }
+  state.patch(node, sup)
+  return state.applyData(node, sup)
+}